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\section{\module{topwindow} ---
         Interface for creating windows that are shown on top of other 
         applications.}
\label{sec:topwindow}

\declaremodule{extension}{topwindow}
\platform{S60}
\modulesynopsis{Interface for creating windows that are shown on top of other 
         applications.}
         
The \module{topwindow} module offers an API for creating windows that are shown 
on top of other applications and managing the content of these windows. 
Images can be inserted into the windows and the background color, visibility, 
corner type and shadow of the window can be manipulated.

\module{topwindow} extension does not provide sophisticated drawing capabilities 
by any means but rather relies on services provided by the \module{graphics} 
extension: \module{topwindow} allows \module{graphics} \class{Image} objects to 
be put into the windows that are represented by \class{TopWindow} objects.

\class{TopWindow} object provides mainly only two services: \class{TopWindow} 
objects can be shown or hidden and Images can be put into the windows. However, 
several images can be added into one \class{TopWindow} object and several 
\class{TopWindow} objects can be created and shown. Since the images can be 
manipulated using the \module{graphics} extension this makes it possible to 
create many kind of content to the \class{TopWindow} objects.

\subsection{TopWindow objects}

\begin{classdesc}{TopWindow}{}
Create a \class{TopWindow} object.
\end{classdesc}

\class{TopWindow} objects have the following methods and properties:

\begin{methoddesc}[TopWindow]{show}{}
Shows the window. The window is not shown until show() is called.
\end{methoddesc}

\begin{methoddesc}[TopWindow]{hide}{}
Hides the window.
\end{methoddesc}

\begin{methoddesc}[TopWindow]{add_image}{image, position}
Inserts an image object \class{graphics.Image} into the window. The position 
of the image is specified by the \var(position) parameter. 
If only the coordinates of the top left corner are specified, like (x1, y1) 
the image is not resized. If four coordinates are given, like(x1, y1, x2, y2), 
the image is resized to fit to the specified area.
\\Example:
\begin{verbatim} 
add_image(image, (10,20))
add_image(image, (10,20,20,30))
\end{verbatim}
\end{methoddesc}

\begin{methoddesc}[TopWindow]{remove_image}{image\optional{,position}}
Removes the image from the window.
Mandatory parameter \var{image} must be a \class{graphics.Image} object. 
Parameter \var{position} may specify the top-left corner coordinates of the 
image or the rectangular area of the image. If only \var{image} parameter is 
given, all the pictures representing this image object are removed from the
window. If both parameters are given, only the picture that matches both 
parameters is removed.
\\Example:
\begin{verbatim}
remove_image(image)
remove_image(image, (10,10))
remove_image(image, (10,10,20,20))
\end{verbatim}
\end{methoddesc}

\begin{memberdesc}[TopWindow]{position}
Specifies the coordinates of the top left corner of the window. Can be read and written.
\\Example: 
\begin{verbatim}
position = (10, 20)
\end{verbatim}
\end{memberdesc}

\begin{memberdesc}[TopWindow]{size}
Specifies the size of the window. Can be read and written.
\\Example:
\begin{verbatim} 
size = (100, 200)
\end{verbatim}
\end{memberdesc}

\begin{memberdesc}[TopWindow]{images}
The images inserted into the window. Defined as a list of tuple objects. Each 
tuple contains a \class{graphics.Image} object and the \var{position} of the 
image. The \var{position} may specify the top-left coordinate of the image and 
optionally also the bottom-right coordinate of the image. Parameter (x,y) 
specifies the top-left coordinate, but does not resize the image while 
parameter like (x1,y1,x2,y2) specifies both the top-left and bottom-right 
coordinates and possibly also resizes the image. Can be read and written.
Also see the \method{add_image()} and \method{remove_image()} methods.
\\Example: 
\begin{verbatim}
images = [(image1,(x1,y1)), (image2,(x1,y1,x2,y2)), (image3,(50,50,100,100))]
\end{verbatim}
sets the window content to be 3 images. \code{image2} and \code{image3} are possibly resized 
while the \code{image1} is not)
\end{memberdesc}

\begin{memberdesc}[TopWindow]{shadow}
Specifies if the shadow of the window is shown and the length of the shadow. 
Can be read and written. Setting \code{shadow = 0} makes the shadow invisible.
\\Example: 
\code{shadow = 5}
\end{memberdesc}

\begin{memberdesc}[TopWindow]{corner_type}
Specifies the corner type of the window. Can be read and written. Corner type 
can be one of the following values: 
\begin{itemize}
\item \code{square}
\item \code{corner1}
\item \code{corner2}
\item \code{corner3}
\item \code{corner5}
\end{itemize}

Example: 
\code{corner_type = "square"}
\end{memberdesc}

\begin{memberdesc}[TopWindow]{maximum_size}
Returns the maximum size of the window as a tuple (width, height). Read only 
property.
\end{memberdesc}

\begin{memberdesc}[TopWindow]{background_color}
The background color of the window as an integer (e.g. \code{0xaabbcc}). The two 
greatest hexadecimal digits specify the red, the next two specify the blue and 
the last ones specify the green color. Can be read and written.
\\Example: 
\code{background_color = 0xffffff} (sets the white color)
\end{memberdesc}

\begin{memberdesc}[TopWindow]{visible}
Can be set to 0 or 1. 1 means that window is visible, 0 means that it is not. 
Can be read and written. Also see the \method{show} and \method{hide} methods.
\end{memberdesc}
